|Antiresonances: a new route to Decoherence|
|IVIC, Caracas, Venezuela|
|vendredi 25 mai 2007 , 15h30|
|Conférence présentée à l'atelier (2007)|
Decoherence in transport is generally understood by invoking Buttiker's voltage probe model or other mechanisms involving phase scrambling of the wavefunction when contacts to a reservoir are considered. Such models are phenomenological and provide no direct mechanism for information loss. Here we show that phase information loss in the context of transport can be explained in terms of a generic instability of quasi 1D systems due to Antiresonances, or zeros of the transmission. Such an instability, combined with a limited resolution is shown to lead to the appropriate decoherent transport with the only condition that the `reservoir' typical energy spacing is smaller than the energy resolution of the experiment.  L. Foa Torres, H. M. Pastawski, and E. Medina Europhysics Letters 73, 164 (2006).